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UNITED sTAWENT FFCE- ERAs'rUs M. srniw,` or BALTIMORE, MARYLAND, AssiG'NoR 'ro JOHN Vanimata.

MACHINE FOR MORTISING TIMBER.

specification of Letters Patent No. 9a7, dated september 25,1833

To all Lo/wm t may concern.:

Be it known that I, ERAs'rUs M. SHAW,

of the city of Baltimore and State of Maryland, have invented a new and useful Improvement in Mortising-Machines; and I do hereby declare thatthe following 1s a full and exact description.

My aim has been to make the machine as firm as possible, and at the same time to make it perfectly portable, so that it may be attached to a table or bench as readily as the common smiths vise; a particular frame or bench being unessential to the machine. The machine is so permanent that it admits of no untruth in the operation, being made of solid castings bolted together. j

In the drawings a., a, Figure 1 represents a section of an ordinary work bench, b, Z2, an iron brace which lies on the bench` having a slot in it with a bolt and nut o, by which itis confined to the bench, and by which the piece b, and the wood piece al, cl, are brought forward, or moved back, as required for different sizes of timber subjected to mortising. The piece d, CZ, is the back against which the timber to be mortised, rests.

The bed g is raised andlowered (in relation to thebench) by means ofthe screw e, which passes through the metal piece f, f, f, f, which is shown in Fig. 2 where the dotted lines represent the bed piece g, rest-ing on the horizontal projection z'. The screw e, after passing through the thick part at the inner f, passes free through the wood piece d, ci, Fig. 1, and d, d, Fig. 3, which shows an end view, and has a washer and nut c, to prevent the screw from rising while by means of the female screw in f the piece j", f, f, rises and sinks with the bed g.

Fig. 1 are iron guides or clamps fast to d, al to hold the piece f, f, f plumb, land in place while moving up and down, and while the machine is in motion.

What has now been described relates to the bench and pieces necessary to hold the timber subjected to the chisel.

z', e', Fig. 1 are side pieces which support, Sac., guide the slide if., which slide contains or holds the chisel Z. m, lever which works the slide; n, rod connecting the lever and treadle p. g, upright to support the front of the machine, the back of the machine rests on the bench a, pa. r, spiral spring .con` nected with the treadle and lever and raises the treadle and draws backthe chisel.

Fig. 4 represents the slide. s, the pin to pass through and join slideand socket to hold it in proper position while cutting;

to reverse the position-of the chisels the pin 1s withdrawn and bymeans of the wing nut t, on the shank of theA slide the position of l l the chisel is altered, or the face is turned, for heading each` end of the mortise. W, is the V.slide upside down,` showing the rack which gears into the section of cogs on the lever fm, of Fig. 1,

Fig. 5, the sidepieces detached The horil zontal projections V, V, having slotholes .I

which lap on the "corresponding pieces w, fw,

and are secured by bolts and nuts, the holes at lv, c being long to regulate the slide between the side pieces, to hold the slide at' all times true. The slide has a projectionl `on each side in form of a V, as seen at Fig. 7, represents a side view. of the working parts of the machine. a, is the slide,b,

the lever, c, rod connecting lever to treadle,

d, and the spiral spring which raises the treadle and bring back the slide with the chisel.

The drawing represents the machine as worked by the foot; and the piece to be mortised as regulated by the hand. The

machine may, however, be propelled by ma- Y chine power, by` the use of slip gearing, as in most other machinery. The machine may be applied to the ordinary work bench, in 10 minutes without any previous preparation simply by 2 screws, to hold the bottom of the side pieces to the bench and the upright piece 2, to support the front of the machine and the prop in Fig. 1, at the inner end of the treadle.

I -claimi 1. The manner of regulating the bed piece, by means of the screw e, and the metal piece f, f, f, and i, Fig. 2, the screw having a Washer and nut under the piece cl, d, Fig. 1 to prevent the screw from rising While it raises Jshe bed piece and lowers it.

2. I claim the construction of the side pecesFg. 5, and the manner of uniting vthem together so as to make the machine rm; and to cause a regularity in the operation of the chisel; and make the machine as portable as possible, as before described. 10

- ERASTUS M. SHAW.

Y Witnesses:

Trios. W.- BOND, BENJAMIN START. 

